Anisotropic Pauli spin blockade in hole quantum dots

作者：Brauns, Matthias^*; Ridderbos, Joost; Li, Ang; Bakkers, Erik P. A. M.; van der Wiel, Wilfred G.; Zwanenburg, Floris A.

来源：Physical Review B, 2016, 94(4): 041411.

DOI：10.1103/PhysRevB.94.041411

• GE/SI HETEROSTRUCTURE NANOWIRE
• ISOTOPE-SEPARATION
• SINGLE-CRYSTALS
• TRANSPORT
• GROWTH

We present measurements on gate-defined double quantum dots in Ge-Si core-shell nanowires, which we tune to a regime with visible shell filling in both dots. We observe a Pauli spin blockade and can assign the measured leakage current at low magnetic fields to spin-flip cotunneling, for which we measure a strong anisotropy related to an anisotropic g factor. At higher magnetic fields we see signatures for leakage current caused by spin-orbit coupling between (1,1) singlet and (2,0) triplet states. Taking into account these anisotropic spin-flip mechanisms, we can choose the magnetic field direction with the longest spin lifetime for improved spin-orbit qubits.

• 出版日期2016-7-22
• 单位北京工业大学